The Sigil Of The Gateway is also know as the ”gate of Yog-Sohoth”. It is found on the cover of the legendary “Necronomicon,” a grimoire mentioned in the work of H. P. Lovecraft.

Yog-Sothoth is a cosmic entity in the Cthulhu Mythos and Dream Cycle of American horror writer H. P. Lovecraft. Yog-Sothoth's name was first mentioned in Lovecraft's novel The Case of Charles Dexter Ward (written 1927, first published 1941). The being is said to take the form of a conglomeration of glowing spheres. It is an all-knowing deity, which means it knows the past, present, and future. -- Wikipedia

For those, who are really serious about their journal. This will be an aspiring author's new best friend.